nsfilehandle | 易学教程

how to write in append mode for text file

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My application navigation based. UItextView for notes UIViewController. I am writing data for text to file. Now i need to write in append mode , the below code i am trying but every time is writing to two time with same text data, and not appending if next text data to file. - (void)saveText:(id)sender { [self.textview resignFirstResponder]; NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDirectory = [documentPaths objectAtIndex:0]; NSString *documentTXTPath = [documentsDirectory stringByAppendingPathComponent:@"Notes

NSString containing hex convert to ascii equivalent

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问题 I have an NSString that has hex information such as <00000020 66747970 4d344120 00000000 4d344120 6d703432 69736f6d 00000000 00031203 which came from NSData. What I need to do is convert that NSString of Hex data to Ascii which would be: [0][0][0] ftypM4A [0][0][0][0]M4A mp42isom[0][0][0][0][0][3][18][3] As you might be able to tell this is a M4A file. I loaded the first part of the file in to NSData using NSFileHandle. I then stored it into NSString: NSData *data = [filehandle

how to write in append mode for text file

阅读更多关于 how to write in append mode for text file

问题 My application navigation based. UItextView for notes UIViewController. I am writing data for text to file. Now i need to write in append mode , the below code i am trying but every time is writing to two time with same text data, and not appending if next text data to file. - (void)saveText:(id)sender { [self.textview resignFirstResponder]; NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDirectory = [documentPaths

How to read data from NSFileHandle line by line?

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问题 I have a text file having data as given e.g. PUFGUjVRallYZDNaazFtVjVObU1zWm5ZcUJUYU5ORk4zbGthNHNDVUdSMlFVQmpSVEoxUUNSallYaFhkanBITXBGR1NTQnpZRTltZE1OalVzSkdXQ0Z6WXR0V2RpTmpTdXgwTWs5V1lZSkZiWjFXT29OV2JSVlhaSTUwYUpwR040UUZXTzVHVXFoWFVRcFdWNHdVTUJ0Q1VHSmxXVlJVTlJCMVE1VTFWV PUFGUjVRallYZDNaazFtVjVObU1zWm5ZcUJUYU5ORk4zbGthNHNDVUdSMlFVQmpSVEoxUUNSallYaFhkanBITXBGR1NTQnpZRTltZE1OalVzSkdXQ0Z6WXR0V2RpTmpTdXgwTWs5V1lZSkZiWjFXT29OV2JSVlhaSTUwYUpwR040UUZXTzVHVXFoWFVRcFdWNHdVTUJ0Q1VHSmxXVlJVTlJCMVE1VTFWV